College of Micronesia-FSM: Dana Lee Ling's Introduction to Statistics Using OpenOffice.org, LibreOffice.org Calc, 4th edition: "Section 2.1: Graphs and Charts”
Read this section.
The table below includes FSM census 2000 data and student seat numbers for the national site of COM-FSM circa 2004.
|State||Population (2000)||Fractional share of national population (relative frequency)||Number of student seats held by state at the national campus||Fractional share of the national campus student seats|
Circle or pie charts
In a circle chart the whole circle is 100% Used when data adds to a whole, e.g. state populations add to yield national population.
A pie chart of the state populations:
The following table includes data from the 2010 FSM census as an update to the above data.
|State||Population (2010)||Relative frequency|
Column charts are also called bar graphs. A column chart of the student seats held by each state at the national site:
If a column chart is sorted so that the columns are in descending order, then it is called a Pareto chart. Descending order means the largest value is on the left and the values decrease as one moves to the right. Pareto charts are useful ways to convey rank order as well as numerical data.
A line graph is a chart which plots data as a line. The horizontal axis is usually set up with equal intervals. Line graphs are not used in this course and should not be confused with xy scattergraphs.
XY Scatter graph
When you have two sets of continuous data (value versus value, no categories), use an xy graph. These will be covered in more detail in the chapter on linear regressions.